A heat insulation structure for elbow box bridging between convection section modules of a heating furnace

Abstract

This utility model relates to a heat exchange insulation structure for elbow boxes between convection section modules of a heating furnace. It includes upper and lower convection section modules, with a corresponding elbow box module connected to the end steel structure of each convection section module. Each convection section module contains an elbow and a straight pipe. Heat exchange tube bundles between adjacent upper and lower convection section modules are connected by jumper pipes. The upper and lower ends of the jumper pipes are respectively located within the corresponding elbow box modules. A heat exchange insulation box is provided between the upper and lower elbow box modules, enclosing the exposed portion of the jumper pipe. Each elbow box module has a jumper sealing plate corresponding to the jumper pipe, and an elongated oval protective sleeve is provided where the jumper pipe passes through the jumper sealing plate. This utility model uses upper and lower segmented elbow box modules for bridging and provides heat insulation at the bridging points, ensuring that the internal temperatures of each convection module's elbow box do not affect each other, protecting the equipment and improving thermal efficiency.

Description

Technical Field

[0001] This utility model relates to the field of heating furnace processing technology, specifically to a heat insulation structure for the elbow box bridging between convection section modules of a heating furnace. Background Technology

[0002] Heating furnaces are essential equipment in the petrochemical industry. They have been used in China for decades, and many heating furnaces now need to be upgraded and renovated. During the renovation process, we analyzed some loss phenomena to find design defects. In response to some problems in the use of heating furnaces, the requirements for renovation have also been raised. When there are two or more convection sections in the heating furnace, the lowest module bears a higher temperature than the upper module. However, the elbow box is unobstructed and connected inside. This causes the steel structure inside the elbow box of the upper module to bear the high temperature of the lower module. Sometimes this can cause local overheating of the upper module, overheating of the crossbeams between modules, and deformation of the steel structure. Utility Model Content

[0003] The purpose of this utility model is to overcome the above-mentioned shortcomings and provide a heat insulation structure for the elbow box bridging between convection section modules of a heating furnace. The elbow box modules are bridging each other in upper and lower sections, and heat insulation treatment is carried out at the bridging point. This ensures that the internal temperature of each convection module elbow box does not affect each other, protects the equipment, and improves thermal efficiency.

[0004] The purpose of this utility model is achieved as follows:

[0005] A heat exchange tube bridging and insulation structure between convection section modules of a heating furnace includes upper and lower convection section modules. The end face steel structure of each convection section module is connected to a corresponding bend tube box module. Each convection section module is provided with an elbow and a straight pipe. The heat exchange tube bundles between adjacent upper and lower convection section modules are connected by a bridging tube. The upper and lower ends of the bridging tube are respectively set in the corresponding bend tube box modules. A bridging and insulation box is provided between the upper and lower bend tube box modules. The bridging and insulation box wraps the exposed part of the bridging tube. The bend tube box module is provided with a bridging sealing plate corresponding to the bridging tube. An elongated oval protective sleeve is provided where the bridging tube passes through the bridging sealing plate.

[0006] Preferably, the bridging insulation box is installed on-site, and the top and bottom of the bridging insulation box are welded to the corresponding bridging sealing plates, and the bridging insulation box is filled with first insulating ceramic fiber cotton.

[0007] Preferably, the bridging sealing plate adopts a segmented bolted connection, including an angle steel, a U-shaped folding plate and a Z-shaped folding plate arranged sequentially from the inside to the outside. The opening of the U-shaped folding plate faces the inside of the bend box module on the corresponding side. The inner side wall of the U-shaped folding plate is bolted to the angle steel, and the outer side wall is bolted to the Z-shaped folding plate. The outer folded edge of the Z-shaped folding plate is bolted to the bend box door.

[0008] Preferably, the angle steel is welded to the end face steel structure corresponding to the convection section module, and a reinforcing rib plate is connected between the upper and lower angle steels.

[0009] The space between the U-shaped folding plate, the Z-shaped folding plate and the oblong protective sleeve is filled with a second thermal insulation ceramic fiber cotton and sealed with a thermal insulation sealing plate.

[0010] Preferably, the bolting position between the U-shaped folding plate and the Z-shaped folding plate is arranged at the center of the cross-connector. The oblong protective sleeve is divided into two parts with the center of the cross-connector. One part is welded to the U-shaped folding plate and the other part is welded to the Z-shaped folding plate.

[0011] Preferably, the U-shaped or Z-shaped folding plate has a side connecting plate welded to its side, and the side connecting plate is bolted to the side wall plate of the elbow box module.

[0012] Preferably, the elbow and straight pipe inside the elbow box module are respectively fitted with elbow insulation sleeve and straight pipe protective sleeve, each protective sleeve is made of aluminum silicate material, and the gap between each protective sleeve is filled with refractory ceramic fiber cotton.

[0013] The beneficial effects of this utility model are:

[0014] The two elbow box modules, which are set up in upper and lower sections, adopt a cross-connection insulation structure, which allows the main convection section module to be transported together with the corresponding elbow box module as a whole. This not only saves transportation costs but also reduces the amount of on-site installation and welding work to a certain extent, and also provides convenience for future local maintenance and disassembly.

[0015] The combined effect of the bridging insulation box, bridging sealing plate, and insulating ceramic fiber cotton effectively isolates the temperature difference between the modules of each elbow box, minimizing the impact of the high temperature generated by the lower elbow box module on the upper elbow box module and reducing localized overheating. This extends the service life of the equipment.

[0016] The elbows and straight pipes inside the elbow box are insulated with aluminum silicate sleeves, and the gaps between the sleeves are tightly filled with ceramic fiber cotton. This structure can reduce the internal temperature of each elbow box module to a certain extent, reducing the risk of overheating. This not only improves thermal efficiency but also protects the steel structure of the equipment to a certain extent, preventing damage caused by overheating. It brings certain economic benefits in terms of equipment maintenance, energy saving, and transportation costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the heat insulation structure of the elbow box bridging between convection section modules of a heating furnace according to the present invention.

[0018] Figure 2 for Figure 1 The left view.

[0019] Figure 3 for Figure 1 AA sectional view.

[0020] Figure 4 for Figure 1 BB cross-sectional view.

[0021] Figure 5 for Figure 1 CC cross-sectional view of the central span connector.

[0022] Figure 6 for Figure 5 A magnified view of a portion of the image.

[0023] Figure 7 This is a top view of the elbow protective sleeve.

[0024] The components include: convection section module 1; end face steel structure 1.1; end tube sheet 1.2; bend box module 2; elbow 3; straight pipe 4; crossover pipe 5; crossover insulation box 6; crossover sealing plate 7; oblong protective sleeve 8; first insulation ceramic fiber cotton 9; angle steel 7.1; U-shaped folding plate 7.2; Z-shaped folding plate 7.3; elbow box door 10; reinforcing rib plate 11; second insulation ceramic fiber cotton 12; insulation sealing plate 13; side connecting plate 14; side wall plate 2.1; elbow insulation sleeve 15; straight pipe protective sleeve 16; refractory ceramic fiber cotton 17. Detailed Implementation

[0025] See Figure 1-7 This utility model relates to a bridging insulation structure between convection section modules of a heating furnace, comprising convection section modules 1 arranged vertically, with a corresponding bend box module 2 connected to the end steel structure 1.1 of each convection section module 1. The bend box module 2 is located outside the end tube plate 1.2 of the convection section module 1 and is used to reverse the heat exchange tube bundles within the convection section module 1. The heat exchange tube bundles within each convection section module 1 are connected by bends 3, which are located within the corresponding bend box module 2. The bend box module 2 is also provided with a straight pipe 4 for the heat exchange medium to enter and exit. The heat exchange tube bundles between adjacent upper and lower convection section modules 1 are connected by bridging pipes 5, with the upper and lower ends of the bridging pipes 5 respectively located within the corresponding bend box modules 2. A bridging insulation box 6 is provided between the upper and lower bend box modules 2, and the bridging insulation box 6 wraps the exposed portion of the bridging pipes 5.

[0026] The bending tube box module 2 is provided with a bridging sealing plate 7 corresponding to the bridging pipe 5. The bridging sealing plate 7 can effectively isolate the temperature difference between adjacent bending tube box modules 2. The bridging pipe 5 is provided with an elongated oval protective sleeve 8 at the bridging sealing plate 7, with a preset displacement length for the thermal expansion of the furnace tube.

[0027] The cross-connecting insulation box 6 is installed on site. The top and bottom of the cross-connecting insulation box 6 are welded to the corresponding cross-connecting sealing plate 7 respectively. The cross-connecting insulation box 6 is filled with the first insulation ceramic fiber cotton 9.

[0028] The bridging plate 7 adopts a segmented bolted connection to facilitate the installation and disassembly of the elbow box module 2. The bridging plate 7 includes, from the inside to the outside, an angle steel 7.1, a U-shaped folded plate 7.2, and a Z-shaped folded plate 7.3. The opening of the U-shaped folded plate 7.2 faces the interior of the elbow box module 2 on the corresponding side. The inner wall of the U-shaped folded plate 7.2 is bolted to the angle steel 7.1, and the outer wall is bolted to the Z-shaped folded plate 7.3. The outer folded edge of the Z-shaped folded plate 7.3 is bolted to the elbow box door 10. The angle steel 7.1 is welded to the end face steel structure 1.1 of the convection section module 1. A reinforcing rib plate 11 is connected between the upper and lower angle steels 7.1 to improve the connection strength between the bridging plate 7 and the convection section module 1. The reinforcing rib plate 11 is installed on site. The segmented bolted structure of the bridging plate 7 can solve the problem of insufficient welding space for the bridging pipe on site. If there is not enough welding space for the bridging pipe on site, the U-shaped folding plate 7.2 and the Z-shaped folding plate 7.3 can loosen the bolts and temporarily move them up and down to make room for welding.

[0029] The space between the U-shaped folding plate 7.2, the Z-shaped folding plate 7.3 and the oblong protective sleeve 8 is filled with a second thermal insulation ceramic fiber cotton 12 and sealed with a thermal insulation sealing plate 13.

[0030] The bolting position between the U-shaped folding plate 7.2 and the Z-shaped folding plate 7.3 is arranged at the center of the cross-connector 5. The elongated protective sleeve 8 outside the cross-connector 5 is divided into two parts with respect to the center of the cross-connector 5. One part is welded to the U-shaped folding plate 7.2 as a whole, and the other part is welded to the Z-shaped folding plate 7.3 as a whole. After installation, an elongated circle will be formed at the cross-connector. The size of the elongated circle is the major axis of the projected ellipse of the cross-connector. The design is a relatively large elongated circle to consider the displacement direction and length of the furnace tube thermal expansion. The gap between the elongated protective sleeve and the nearest point of the cross-connector is 10mm to ensure that it does not affect the thermal expansion of the cross-connector. The height of the elongated protective sleeve can be consistent with the height of the insulation lining.

[0031] Side connecting plates 14 are welded to the sides of U-shaped folding plates 7.2 and Z-shaped folding plates 7.3, and the side connecting plates 14 are bolted to the side wall plates 2.1 of the elbow box module 2.

[0032] The elbow 3 and straight pipe 4 inside the elbow box module 2 are respectively fitted with elbow insulation sleeve 15 and straight pipe protective sleeve 16. Each protective sleeve is made of aluminum silicate material, and the gap between each protective sleeve is filled with refractory ceramic fiber cotton 17.

[0033] The straight pipe protective sleeve 16 is composed of two semicircles and is fixed with stainless steel cable ties. The elbow insulation sleeve 15 is made according to the shape of the elbow and maintains a certain gap with the outer wall of the elbow so that the elbow insulation sleeve cannot be displaced as the furnace tube expands due to heat.

[0034] In addition to the above embodiments, this utility model also includes other implementation methods. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of this utility model.

Claims

1. A heating furnace convection section module inter-bend box cross-connection heat preservation structure, comprising upper and lower arranged convection section modules, the end face steel structure of each convection section module corresponds to connect the bend box module, and a bend and a straight pipe are arranged in each convection section module, characterized in that: The heat exchange tube bundles between adjacent upper and lower convection section modules are connected by a jumper pipe. The upper and lower ends of the jumper pipe are respectively set in the corresponding bent tube box module. A jumper insulation box is provided between the upper and lower bent tube box modules. The jumper insulation box wraps the exposed part of the jumper pipe. The bent tube box module is provided with a jumper sealing plate corresponding to the jumper pipe. An elongated oval protective sleeve is provided where the jumper pipe passes through the jumper sealing plate. ​ 2. The elbow box bridging insulation structure between convection section modules of a heating furnace according to claim 1, characterized in that: The bridging insulation box is installed on site. The top and bottom of the bridging insulation box are welded to the corresponding bridging sealing plates, and the bridging insulation box is filled with first insulation ceramic fiber cotton.

3. The elbow box bridging insulation structure between convection section modules of a heating furnace according to claim 1, characterized in that: The bridging plate adopts a segmented bolted connection, including angle steel, U-shaped folded plate and Z-shaped folded plate arranged sequentially from the inside to the outside. The opening of the U-shaped folded plate faces the inside of the bend box module on the corresponding side. The inner wall of the U-shaped folded plate is bolted to the angle steel, and the outer wall is bolted to the Z-shaped folded plate. The outer folded edge of the Z-shaped folded plate is bolted to the bend box door.

4. The elbow box bridging insulation structure between convection section modules of a heating furnace according to claim 3, characterized in that: The angle steel is welded to the end face steel structure corresponding to the convection section module, and a reinforcing rib plate is connected between the upper and lower angle steels.

5. The elbow box bridging insulation structure between convection section modules of a heating furnace according to claim 3, characterized in that: The space between the U-shaped folding plate, the Z-shaped folding plate and the oblong protective sleeve is filled with a second thermal insulation ceramic fiber cotton and sealed with a thermal insulation sealing plate.

6. The elbow box bridging insulation structure between convection section modules of a heating furnace according to claim 3, characterized in that: The bolting position between the U-shaped folding plate and the Z-shaped folding plate is arranged at the center of the cross-connector. The oblong protective sleeve is divided into two parts with the center of the cross-connector. One part is welded to the U-shaped folding plate and the other part is welded to the Z-shaped folding plate.

7. The elbow box bridging insulation structure between convection section modules of a heating furnace according to claim 3, characterized in that: Side connecting plates are welded to the sides of U-shaped and Z-shaped folding plates, and the side connecting plates are bolted to the side wall plates of the bent pipe box module.

8. The elbow box bridging insulation structure between convection section modules of a heating furnace according to claim 1, characterized in that: The elbows and straight pipes inside the bending box module are respectively fitted with elbow insulation sleeves and straight pipe protective sleeves. Each protective sleeve is made of aluminum silicate, and the gaps between the protective sleeves are filled with refractory ceramic fiber cotton.

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